Malicious PDF — malware analysis report

Static analysis result for SHA-256 574c1fc3137f162a…

MALICIOUS

PDF

40.4 KB Created: 2020-08-19 08:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4a47924dbd6b2c0a8ac67700082b4ae SHA-1: d76378d4f2debfa56d26f0056ec61146afa99d6e SHA-256: 574c1fc3137f162a386a322c4e5576d267fda4ee5db67e963cbb29d1c2918cc5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded URLs, many of which are part of a link farm hosted on Shopify. One of these URLs, 'https://ttraff.ru/pify?keyword=music+cd+audio+format', is identified as a malicious redirector. The presence of a link farm and a malicious redirector suggests an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=music+cd+audio+format
    • http://nabav.mccoypotterymuseum.com/uploads/1/3/1/1/131164250/mazopekonuzidone.pdf
    • http://wisoduxef.fairysredcolordiet.com/uploads/1/3/0/8/130874049/9416797.pdf
    • https://cdn.shopify.com/s/files/1/0433/5838/8383/files/48515923962.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2166/files/penivojawij.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/rofutorab.pdf
    • https://cdn.shopify.com/s/files/1/0437/8047/2984/files/catecismo_de_la_iglesia_catolica_para_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0431/4343/0305/files/tuxepisozorinudedawuduvo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0924/4317/files/5630463068.pdf
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/bafopazafanonovego.pdf
    • https://cdn.shopify.com/s/files/1/0434/0963/7530/files/47688318542.pdf
    • https://cdn.shopify.com/s/files/1/0431/0227/3697/files/36410484387.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4436/files/67234405945.pdf
    • https://cdn.shopify.com/s/files/1/0443/1645/9164/files/mayka_marika_kukucova.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/27635501807.pdf
    • https://cdn.shopify.com/s/files/1/0437/3279/5541/files/87090068948.pdf
    • https://cdn.shopify.com/s/files/1/0433/9721/8458/files/sagabimuxunifutotedan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000604d.bin
3273388165868b38433c09f4cfd53101e314e561ea110e353ab38c0be8d3f61d
pdf-font-stream PDF embedded font (sfnt) at offset 0x604D 5140 bytes
font_01_sfnt_off000071ae.bin
7295dc37ec0e2e610e26fa661060d9599afcd1d659f4fadf27b8b734d22b1ca6
pdf-font-stream PDF embedded font (sfnt) at offset 0x71AE 10272 bytes